HTML API: Add support for PRE and LISTING elements.

Adds support for the following HTML elements to the HTML Processor:

 - PRE, LISTING

Previously, these elements were not supported and the HTML Processor would bail when encountering them. Now, with this patch applied, it will proceed to parse an HTML document when encountering those tags.

Developed in WordPress/wordpress-develop#5903

Props jonsurrell, dmsnell
Fixes #60283


Built from https://develop.svn.wordpress.org/trunk@57317


git-svn-id: https://core.svn.wordpress.org/trunk@56823 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: dmsnell

wp-includes/html-api/class-wp-html-processor.php

@@ -102,7 +102,7 @@
  *  - Containers: ADDRESS, BLOCKQUOTE, DETAILS, DIALOG, DIV, FOOTER, HEADER, MAIN, MENU, SPAN, SUMMARY.
  *  - Custom elements: All custom elements are supported. :)
  *  - Form elements: BUTTON, DATALIST, FIELDSET, LABEL, LEGEND, METER, PROGRESS, SEARCH.
- *  - Formatting elements: B, BIG, CODE, EM, FONT, I, SMALL, STRIKE, STRONG, TT, U, WBR.
+ *  - Formatting elements: B, BIG, CODE, EM, FONT, I, PRE, SMALL, STRIKE, STRONG, TT, U, WBR.
  *  - Heading elements: H1, H2, H3, H4, H5, H6, HGROUP.
  *  - Links: A.
  *  - Lists: DD, DL, DT, LI, OL, LI.
@@ -112,7 +112,7 @@
  *  - Sectioning elements: ARTICLE, ASIDE, HR, NAV, SECTION.
  *  - Templating elements: SLOT.
  *  - Text decoration: RUBY.
- *  - Deprecated elements: ACRONYM, BLINK, CENTER, DIR, ISINDEX, KEYGEN, MULTICOL, NEXTID, SPACER.
+ *  - Deprecated elements: ACRONYM, BLINK, CENTER, DIR, ISINDEX, KEYGEN, LISTING, MULTICOL, NEXTID, SPACER.
  *
  * ### Supported markup
  *
@@ -684,10 +684,12 @@ private function step_in_body() {
 			case '-FOOTER':
 			case '-HEADER':
 			case '-HGROUP':
+			case '-LISTING':
 			case '-MAIN':
 			case '-MENU':
 			case '-NAV':
 			case '-OL':
+			case '-PRE':
 			case '-SEARCH':
 			case '-SECTION':
 			case '-SUMMARY':
@@ -732,6 +734,18 @@ private function step_in_body() {
 				$this->insert_html_element( $this->state->current_token );
 				return true;
 
+			/*
+			 * > A start tag whose tag name is one of: "pre", "listing"
+			 */
+			case '+PRE':
+			case '+LISTING':
+				if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) {
+					$this->close_a_p_element();
+				}
+				$this->insert_html_element( $this->state->current_token );
+				$this->state->frameset_ok = false;
+				return true;
+
 			/*
 			 * > An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6"
 			 */
@@ -1007,7 +1021,6 @@ private function step_in_body() {
 			case 'INPUT':
 			case 'LI':
 			case 'LINK':
-			case 'LISTING':
 			case 'MARQUEE':
 			case 'MATH':
 			case 'META':
@@ -1021,7 +1034,6 @@ private function step_in_body() {
 			case 'OPTION':
 			case 'PARAM':
 			case 'PLAINTEXT':
-			case 'PRE':
 			case 'RB':
 			case 'RP':
 			case 'RT':

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57316';
+$wp_version = '6.5-alpha-57317';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.